Injector



W. E. DODGE.

(ModeL) INJEGTORL No. 364,495. PatentedJuIie '7, 1887.-

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UNITED STATES PATENT OFFICE.

WALTER E. DODGE, OE EVERETT," ASSIGNOR TO THE NATIONAL TUBE WORKS COMPANY, OF BOSTON, MASSAOHUSETTS.

INJECTOR.

fiaPECIFICATION' forming part of Letters Patent No. 364,495, dated June 7, 1887.

Application filed April 1, i887. Serial No. 233,303. (ModeLl consists in the improved construction, which I will now proceed to describe and claim.

Of the accompanying drawings, forming a part of this specification, Figure 1 represents a side elevation of my improved injector. Fig. 2 represents a longitudinal section of the same. Fig. 3 represents aside elevation of the steamcone and the combining-cone removed from the casing.

The same letters of reference indicate the same parts in all the figures.

In the drawings, a represents the casing of the injector, having external screw-threads, b b, at its ends to receive the coupling-nuts c c, which'connect the casinga respectively wit-h the steam supply-pipe e and the pipe f, through which water is forced by the injector to the boiler. The casing is also provided with the lateral branch 9, through which water enters, and with the valved overfiow passage h.

i represents the steam-cone,which has an enlarged extern all y-thread ed shoulder, i, adapted to be screwed into the internally'threaded end of the combining and delivery cone j. Said combining and delivery cone is made in a single piece, enlarged at the receiving end, and provided there with apertures 2, through which the water enters. Near said receiving end the cone 3' is suddenly reduced in diameter, forming an annular shoulder, 3,which rests on an annular seat, 4., formed in an inwardlyprojecting flange, 6, in the casing a. Below the shoulder3the exterior of the cone j is made smaller than the orifice 5, surrounded by said flange, an annular space existing between the exterior of the cone below the shoulder 3 and the said orifice.

At a point, 7 below the shoulder 3, the cone j is reduced in diameter to the point 8, where its diameter is increased to form an enlargementor plug, 9, the surface of which is slightly tapered, and is ground to fit a ground socket, 10, in the casing a, the enlargement or plug 9 i being not larger, and preferably smaller, in

diameter than the enlarged portion under the shoulder 3, so that the cone j can be freely withdrawn from the casing. The enlargement 9 is made so that its ends coincide with the ends of the socket 10, in which it is fitted, so that there are no re'entrant angles formed by the surfaces of the enlargement and the adj acent surfaces of the casing, such as would be formed if the enlargement 9 projected from one or both ends of the socket.

It has been found that very hard incrustations are often formed on the surfaces of the heated parts of inj ectors with which the water comes in contact, and that such incrustations when formed in such locations asthe re-entrant angles above mentioned make it very difficult to separate the movable portion, whose sur face formsa part of said angle, from the casing or fixed part when it isdcsired to separate the members of the injector. By forming the cone j and enlargement 9 and the casing-socket 10 as above described, so as to avoid re-entrant angles, I entirely obviate this objection.

The steam-cone i is formed with a threaded shoulder or enlargement, t', outside of the threaded shoulder t", which is screwed into the cone j, said shoulder i being engaged with an internal thread in the casing.

The steam-cone z is screwed into the combining and delivery cone 9' before the two are inserted in the casing, so that the delivery-cone is applied and removed with the steam-cone, the arrangement of the threads on the shoulders z" t of the steam-cone and of the internal threads with which they engage. being such that when the steam-cone is unscrewed from the casing it is turned in the direction required to screw it into the conej; hence the two cones cannot be separated by the act of removing the steam'cone from the casing.

The conej is provided with orifices 0 0 and q q. The orifices 0 o are near the receiving end of the cone. The orifices g are about halfway between the receivingand delivering ends.

By making the enlargement 9 slightly taper ing I enable it to be quickly freed from contact with the socket 10 when the cone j is be ing unscrewed.

It will be seen that the construction is extremely simple and free from moving or adjustable parts; hence the injector is durable and can be made at a small expense.

This injector can be used either as a lifting or a non-lifting injector, and has in practice lifted Water seven feet with perfect case. It is especially intended for use with farm-engines, for which use its cheapness, simplicity, and durability commend it.

I claim- The combination of the casing a, having the internal flange, 6, and the internal socket, 10, the former being provided with the seat4 and orifice 5, the combining-cone j, formed in one piece and provided with the shoulder 3, fitting the seat 4, and the enlargement 9, fitting the socket 10, all parts of said cone 9' below the shoulder 3 being smaller than the orifice 5, and

WALTER r, DODGE,

Witnesses:

' O. F. BROWN,

A. D. HARRISON, 

